I have not started the game yet, at what point in the game does the first video appear? so I can do some testing (deepl translate)

The first video when starting a new game. It's essentially an intro video. Not a huge deal, since I already saw this a couple of times on my desktop pc. I find missing the other video's a bigger deal. Usually these are a sort of "closure" video's. So when following a route, at the end there'll be an ending video. You can actually still find these video's in the game folder in your steam install folder. But obviously it would be more fun and enjoyable when being able to watch when playing the game on your deck.

Hello, may I chime in?

Have you tried installing k-lite?

I've browsed through some VN fan sites and it may or may not work.